Methanogens: a new guild of mercury methylators
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منابع مشابه
Methanogens: principal methylators of mercury in lake periphyton.
Mercury methylation and demethylation rates were measured in periphyton biofilms growing on submerged plants from a shallow fluvial lake located along the St. Lawrence River (Quebec, Canada). Incubations were performed in situ within macrophytes beds using low-level spikes of (199)HgO and Me(200)Hg stable isotopes as tracers. To determine which microbial guilds are playing a role in these proce...
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Microbial mercury (Hg) methylation transforms a toxic trace metal into the highly bioaccumulated neurotoxin methylmercury (MeHg). The lack of a genetic marker for microbial MeHg production has prevented a clear understanding of Hg-methylating organism distribution in nature. Recently, a specific gene cluster (hgcAB) was linked to Hg methylation in two bacteria.1 Here we test if the presence of ...
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1 Advances in genetics have allowed for greater investigation into the complex microbial 2 communities mediating mercury methylation in the environment. In wetlands in particular, 3 dissolved organic matter (DOM) may influence methylmercury production both through direct 4 chemical interactions with mercury and through substrate effects on the environmental 5 microbiome. We conducted microcosm ...
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Background and Objectives: Changes in lifestyles and food patterns and consumption of ready-to-eat and fried foods have increased probability of chronic non-communicable diseases (NCDs). Studies have illustrated associations between salt, total fat, saturated fatty acid and trans fatty acid contents of the industrial and guild fried products in Iran. Materials & Methods: In this study, 69 sam...
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Methylmercury has been thought to be produced predominantly by sulfate-reducing bacteria in anoxic sediments. Here we show that in circumneutral pH sediments (Clear Lake, CA) application of a specific inhibitor of sulfate-reducing bacteria at appropriate concentrations typically inhibited less than one-half of all anaerobic methylation of added divalent mercury. This suggests that one or more a...
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